Astronomical Observatory: Cool Images

M67, John Mondi

M67 is one of the oldest known open clusters, aged at 3.2 billion years in the star catalogue 2000. It has
been calculated that M67 can expect to exist as a cluster for about another 5 billion years. The total number
of stars in M67 is probably about 500. M67 is an age of the same order of magnitude as our solar system, its
stars have a similar chemical composition as the sun.

The estimated angular
diameter of the galaxy is estimated to be about 12 minutes.